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The 49ers have announced a media conference call scheduled for this afternoon with Jim Harbaugh has been canceled. The 49ers coach is having a follow-up evaluation related to the electrical cardioversion he underwent Thursday for an irregular heartbeat, the team said.

The 49ers sent out at an e-mail at 4:29 p.m. to notify media members the conference call, scheduled for 4:30 p.m., had been canceled.

Harbaugh is scheduled to address the media at noon Wednesday at the team facility in Santa Clara.

** The 49ers have signed former Virginia Tech safety Eddie Whitley to the practice squad to fill the spot vacated by defensive tackle Matthew Masifilo, who was signed by the Buccaneers last week.

Whitley (6-0, 191), an undrafted rookie who was released by the Cowboys following training camp, was a second-team all-ACC pick last year. As a junior, he shared team-high honors with seven tackles in a 40-12 loss to Stanford in the Orange Bowl, Harbaugh’s final game as the Cardinal coach.

Whitley is the second safety on the eight-man practice squad. The other is rookie Michael Thomas from Stanford.